JPH08232293A - High-concentration dredging device - Google Patents

Abstract

PURPOSE: To enable continuous high-concentration dredging. CONSTITUTION: A slanted conveyor 1 is covered with a hermetic hood 12 having an excavation opening 11 in its lower part, and a plurality of planar drilling blades 10 are provided on the chains 9 of the conveyor 1. The hermetic hood 12 is provided with a bottom guide face 17A, and a sediment storage tank 19 is provided above the bottom guide face 17A. The drilling blades 10 scrape up sediment D continuously to the bottom guide face 17A inside the hermetic hood 12. Water is drained off the sediment D in an air atmosphere inside the hermetic hood 12, and the sediment D is dumped into the sediment storage tank 19.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high-concentration dredging device for continuously dredging mud deposited on the bottom of water at a high concentration.

[0002]

2. Description of the Related Art In sludge dredging, it is desirable to prevent water from being mixed in as much as possible during dredging and to dredge in a piled state. Therefore, various dredging devices are used according to the purpose. For example, in the suction method using a pump, the accumulated mud is sucked as it is or with stirring, so the mud flows into the suction port along the flow of the mud, and depending on the soil quality, a so-called water passage can easily form in the mud. If a path is created, it will suck in the surrounding water, making it difficult to dredge with high mud content. In addition, the grab method using a grab bucket dredges the mud accumulated by the grab bucket.However, when performing a dredging of a thin layer of about 30 to 40 cm, the shape of the grab bucket prevents excess water from being taken up. There is a problem that it becomes difficult to perform high-concentration dredging in a thin layer, and the mud in the grab bucket dredged at the bottom of the water is opened on the dredging vessel each time, so that the dredging work becomes intermittent.

In order to solve these problems and enable high-concentration dredging, for example, in Japanese Patent Publication No. 6-895557,
A rotary excavator unit having a rotary body and a plurality of slide excavating blades that can project radially outward from the outer periphery of the rotary body, a mechanism for driving the slide excavating blade, and an outer periphery of the rotary body. A fixed cutting machine section having plate-shaped bottom surface cutting blades opposed to each other through a desired gap, a mechanism for lifting mud cut from the ground by the slide excavating blade and the bottom surface cutting blade, and the slide The excavating blade has a shaft protruding laterally and a guide roller supported by this shaft, and a mechanism for driving the slide cutting blade is brought into contact with the guide roller, and when the rotating body rotates, A dredging device has been proposed that has a drilling blade pushing-in guide for gradually pushing the slide drilling blade toward the inside of the rotary body.In this dredging device, excessive water intrusion is suppressed by driving the slide cutting blade. Is for dredging mud in a non-disrupting conditions. Further, in Japanese Patent Publication No. 5-61413, a plurality of buckets having a charging port at the bottom are provided on a cutter wheel, and an opening is provided on the inside of the cutter wheel so that mud excavated by the bucket is charged into the upper part. A mud storage tank equipped with a section is attached, a disturbance vane is provided in the mud storage tank, the upper part of the cutter wheel is covered with an airtight hood, and a supply port for continuously supplying pressurized air to the airtight hood is provided. A high-concentration dredging device is proposed, which is equipped with a pump that presses the mud in the mud storage tank to the treatment site through a pipeline, and this high-concentration dredging device creates an air atmosphere in water with an airtight hood. The mud dredged in the bucket enters the air atmosphere and is drained, so that the mud with a high mud content is dredged.

[0004]

All of the above-mentioned devices developed for high-concentration sludge dredging have a structure that prevents the intake of excess water as much as possible, and perform dredging with an appropriate soil thickness. In case of high concentration, dredging is possible.

However, in any of the devices, when the dredging soil thickness is different from the appropriate soil thickness of the dredging device, the dredging is performed in a thin layer, or when the dredging layer is thick and divided into two or three layers, the dredging is performed. Excess water will be taken in from the part where the soil thickness is not appropriate. For example, when excavating a mud layer having a thickness of about ½ of the appropriate soil thickness, almost the same amount of water as the mud is taken in, which makes dredging at high concentration difficult.

Therefore, an excavating blade suitable for the dredging mud thickness is required, but it is expected that it will be difficult to cope with it if the dredging mud thickness changes within the same area.

Therefore, the present invention provides a high-concentration dredging device having a simple structure and capable of continuous high-concentration dredging, and capable of variably performing dredging according to the soil quality and the thickness of the mud layer. With the goal.

[0008]

According to a first aspect of the present invention, there is provided a conveyor which is obliquely installed in an airtight hood having an opening for excavation at a lower portion thereof, and a plurality of conveyors which are provided on an endless belt of the conveyor and project outward. An excavating blade, a rotary drive means for rotationally driving the endless belt of the conveyor, a bottom guide surface provided in the airtight hood and provided substantially parallel to the outer periphery of the endless belt at intervals. A mud storage tank that is provided in communication with the inside of the airtight hood at the upper part of the bottom guide surface and has a charging port for charging the mud scraped up on the bottom guide part by the drilling blade, and air connected to the airtight hood. A high-concentration dredging device comprising: a supply port; and a pressure-feeding unit that pressure-feeds the mud in the mud storage tank to a treatment site via a pipeline.

A second aspect of the present invention is the high-concentration dredging apparatus according to the first aspect, wherein an angle adjusting mechanism for integrally tilting the conveyor and the bottom guide surface is provided.

[0010]

According to the first aspect of the present invention, the endless belt is rotationally driven so that the excavating blade continuously scrapes up the mud onto the bottom guide surface in the airtight hood and drains it in the air atmosphere of the airtight hood. The mud with low water content is sent to the treatment plant through the pipeline. And since the excavating blade pushes up and conveys the mud along the bottom guide surface, it is possible to use a flat plate-shaped excavating blade,
Muddy soil is less likely to adhere to the drilling blade, and it is more difficult to scoop up water. Further, since the mud scraped up from the excavation opening to the bottom guide surface is put into the mud storage tank above the guide surface, the lifted mud distance becomes relatively short.

According to the second aspect of the present invention, by adjusting the angle between the conveyor and the bottom guide surface from small to large, it is possible to dredge layers having different thicknesses from thin mud to thick mud. Further, in the case of dredging mud having a high viscosity, if the angle is made smaller, the excavating blade becomes closer to vertical, and the mud is less likely to adhere to the excavating blade.

[0012]

Embodiments of the present invention will be described below with reference to the accompanying drawings. 1 to 4 show a first embodiment of the present invention, in which a dredging device main body S is provided with a conveyor 1 obliquely installed with its front side being high and its rear side being low.
Forms a plane substantially H-shaped machine frame 4 in which the centers of the conveyor side frame parts 2 and 2 arranged in parallel to each other are connected by a widthwise conveyor center frame part 3, and the front side of these conveyor side frame parts 2 and 2 is formed. Further, a drive shaft 6 and a driven shaft 7 are rotatably provided on the rear side through a bearing 5, and sprockets 8, 8 and 8 are fixed to the left, right and center of the drive shaft 6 and the driven shaft 7, respectively. , The front and rear corresponding sprockets 8 and 8 are hooked with a chain 9 which is an endless belt, and a plurality of excavating blades 10 are provided at equal intervals on these left, right and center chains 9, 9 and 9.
The digging blades 10 are provided so as to project to the outer peripheral side of the conveyor 1, and these digging blades 10 are plate-shaped and have a lateral width dimension substantially corresponding to the interval between the left and right conveyor side frame portions 2 and 2. The drilling blade 10 is held orthogonally to the length direction of the chain 9,
In addition, the inner ends 10A, 10A of the excavating blades 10, 10 adjacent to each other in the front and rear
The spaces are open. The chain 9 has at least a transport path 9A on the bottom surface that is obliquely provided from the lower rear portion to the upper front portion. Further, the conveyor 1 is covered with an airtight hood 12 having an opening 11 for excavation at the bottom, and the airtight hood 12 includes left and right side plate portions 13 and 13, and these side plates 1.
Assemble the body 14 that connects 3 and 13 airtightly,
The left and right side plates 13, 13 are integrally provided on the left and right conveyor side frame portions 2, 2. Further, the body portion 14 has an upper surface portion 15, a front semicircular curved portion 16 and a bottom guide portion 17, and the front and rear edges of the substantially flat plate-shaped bottom guide portion 17 are bent downward. A bottom guide surface 17A, which is an inner surface of the bottom guide portion 17, is provided on the outer periphery of the chain 9 in parallel at a distance. A charging port 18 for charging mud D is continuously provided in the airtight hood 12 above the bottom guide surface 17A, and a mud storage tank 19 is provided below the charging port 18.
This mud storage tank 19 is provided integrally with the airtight hood 12 and is airtightly provided inside. The mud storage tank 19
A sand pump 20, which is a pressure feeding means, is provided at the tip of the rotary drive shaft 20A of the sand pump 20, and a disturbing blade 21 is provided at the tip of the sand pump 20 to pass the mud D sucked by the sand pump 20 through a drain mud pipe 22 that is a pipeline. It is designed to be pumped to the treatment plant. An air supply port 23 for sending air into the airtight hood 12 is provided on the upper part of the airtight hood 12.
A pipe 24 is connected to 23, and the pipe 24 is connected to an air supply means (not shown) such as an air compressor provided in a dredger (not shown) on the water surface.

The dredging device main body S provided with the conveyor 1, the airtight hood 12 and the mud storage tank 19 has an angle adjusting mechanism 25.
The tilt angle θ can be adjusted by means of the angle adjusting mechanism 25 so that the hanging member 27 can be rotated substantially at the center of the upper surface portion 15 of the airtight hood 12 via a connecting shaft 26 in the left-right direction. The suspension member 27 and the rear side of the upper surface portion 15 are connected to each other by a telescopic arm 28 such as a hydraulic cylinder, and both ends of the telescopic arm 28 are pivotally connected to each other. The inclination of the dredging device body S is adjusted. Further, as shown in FIG. 2, a rotation driving means 29 such as a motor for driving the driving shaft 6 to rotate is provided on the front left side of the airtight hood 12, and the driving means 29 is provided.
Is also stored in an airtight case 30.

Reference numeral 31 is a horizontal holding body provided at the rear portion of the conveyor, which holds the obliquely installed main body S of the dredging device so as to move horizontally.
Is a horizontal plate placed parallel to the excavation surface 32 on the bottom of the water after excavation.
33 and the left and right brackets standing on the rear of this horizontal plate 33
34, 34 and left and right side plates that sandwich the excavation opening 11 from the left and right
35 and 35 are integrally formed, the horizontal plate 33 is formed to be slightly wider in the left-right direction than the excavation opening 11, and the lower end of the telescopic arm 36 is provided above the bracket 34 via a connecting shaft 36D. In addition to connecting, the upper end of the telescopic arm 36 is connected to the suspension member 27 via a connecting shaft 36U.
The expandable arm 36 and the bracket 34 centering around U and 36D
Are rotatable and can fix their mutual angles, and a hydraulic cylinder or the like is used for the telescopic arm 36. The suspension member 27 is a ladder connected to the dredger.
It is connected to 37 via a horizontal rotation mechanism 38. In addition, a plurality of obstacle protection claws 39 are provided in the lower part of the bottom guide portion 17 of the airtight hood 12 side by side in the left-right direction.
An upper end 39U of the protection claw 39 is connected to the side of the bottom guide portion 17 so that the angle can be adjusted and fixed, and the angle of the protection claw 39 can be adjusted.
The height of the lower end 39D of 39 is adjusted to the horizontal plate 33.
Incidentally, reference numeral 41 in the drawing denotes a depth measuring tube which is a depth measuring means, and has a detection unit 41A for measuring the depth at the lower end. Reference numeral 42 in the drawing denotes a mud level sensor, which has a detection portion 42A at the lower end for detecting the height of the mud D in the mud storage tank 19.

The operation of the above construction will be described. The rudder 37 of the dredging ship is horizontally swung to horizontally move the dredging device main body S attached to the tip of the rudder 37 toward the left front side in FIG. . At the same time, 29
As a result, the chain 9 of the conveyor 1 is driven to rotate clockwise, and compressed air is supplied from the air supply port 23. Then, the mud D fed onto the bottom guide surface 17A by the excavating blade 10 provided on the chain 9 is continuously collected in the mud storage tank 19 from the inlet 18 at the upper part of the bottom guide surface 17A. At this time, the compressed air is continuously supplied from the air supply port 23 into the airtight hood 12 to keep the air above the water level W in the hood shown by the two-dot chain line in FIG. Due to 10, the mud D carried obliquely upward on the bottom guide surface 17A is drained well, and the high-concentration mud D having a low water content is collected in the mud storage tank 19, and the mud D has a low water content. Therefore, at the same time as the operation of the sand pump 20 for sucking this, the disturbing blades 21 disturb the mud D and pass through the mud pipe 22 in a state suitable for pumping to the dredger as the treatment site or the landfill as the treatment site. Is sent. In addition, a plurality of obstacle protection claws 39 provided on the front side of the excavation opening 11 remove foreign matters of the mud D on the front side of the excavation opening 11 to obstruct the conveyor 1 and the sand pump 20. Are prevented from mixing in. Further, by the horizontal holding body 31 provided at the lower rear,
The inclined dredging device main body S can perform the dredging while stably moving horizontally, and the horizontal plate 33 of the horizontal holder 31 flattens the excavated surface 32 after the dredging substantially horizontally. Then, after the ladder 37 is swung in one direction to perform dredging within a predetermined range, the horizontal turning mechanism 38 horizontally turns the dredging device body S by 180 ° to swing the rudder 37 in the other direction and dredge. I do. Further, the depth measuring pipe 41 pumps compressed air into the airtight hood 12 according to the water pressure at the working position of the dredging device main body S, and the excavating blade 10 of the conveyor 1 continuously stores the mud D in the mud storage tank. It is thrown into 19 and continuous dredging is done. Further, in order to prevent the sand pump 20 from idling, the sand pump 20 is driven by the mud level sensor 42 while the mud storage tank 19 stores a predetermined amount or more of mud D. In the dredging device body S, the excavating blade 10 pushes up the mud D along the bottom guide surface 17A so as to convey the mud D to the mud storage tank 19.
A flat plate can be used for the transport path 9A
In the above, since the cutting blade 10 moves vertically to the guide surface 17A with a certain inclination, the mud D is less likely to adhere to the excavating blade 10 even when used for dredging the mud D having high viscosity. Further, in the conventional bucket type, the bucket scoops water together with mud, but the flat plate-shaped excavating blade 10 allows good drainage and reduces the amount of water to be scooped up.

Further, the angle adjusting mechanism 25 adjusts and increases the inclination angle θ of the dredging device main body S, so that the effective height dimension H of the excavation opening 11, that is, the lower end of the rear guide edge 18 is horizontal. Since the height interval with the plate 33 is increased, the deep mud D can be dredged. The height position of the horizontal plate 33 is substantially equal to the lowest position of the tip of the excavating blade 10 that is rotationally driven. In this case, as shown in FIG. 4, the dredging device body S is tilted at an inclination angle θ of 45 degrees, and the obstacle protection claw 39 is rotated to close the front of the excavation opening 11.
Further, the horizontal holding body 31 expands and contracts the telescopic arm 36 and rotates the connecting shafts 36U and 36D at both ends to fix the horizontal holding body 31 in the parallel position. By the way, when the inclination angle θ is 30 degrees, the effective height dimension H is 200 mm, and when it is 45 degrees, the effective height dimension H is about 450 mm, which is more than double. And drilling blade 10
Is held orthogonally to the length direction of the chain 9, therefore, when the inclination angle θ is 45 degrees, the excavating blade 10 also has an inclination of 45 degrees as shown in FIG. The deep mud D can be dredged well.

As described above, in this embodiment, according to claim 1, the conveyor 1 obliquely installed in the airtight hood 12 having the opening 11 for excavation at the bottom, and the chain 9 which is an endless belt of the conveyor 1 are provided. A plurality of drilling blades 10 provided on the
A rotary drive means 29 for rotationally driving the chain 9 of the conveyor 1, a bottom guide surface 17A provided in the airtight hood 12 and substantially parallel to the outer circumference of the chain 9 at intervals, and a bottom guide surface 17A of the bottom guide surface 17A. A mud storage tank 19 provided at the upper part in communication with the airtight hood 12 and having an input port 18 for inputting the mud D scraped up on the bottom guide surface 17A by the excavating blade 10, and an air supply connected to the airtight hood 12. Since the mouth 23 and the sand pump 20 which is the pressure feeding means for pressure feeding the mud D in the mud storage tank 19 to the processing site through the drainage pipe 22 which is a pipeline are provided, the excavating blade is driven by the rotation of the chain 9. 10 is mud D
Is continuously scraped up to the bottom guide surface 17A in the airtight hood 12, and the mud D is drained in the air atmosphere of the airtight hood 12 and then put into the mud storage tank 19 to obtain the mud having a low water content. D is sent to the treatment plant via the sludge discharge pipe 22, and continuous high-concentration dredging can be performed. Since the excavating blade 10 pushes up the mud D along the bottom guide surface 17A and conveys it, the structure is relatively simple.
Since it is possible to use a flat plate for the excavating blade 10,
It becomes difficult for mud to adhere to the excavating blade 10 and it is difficult to scoop up water, and the excavation opening 11 to the bottom guide surface 17
Since the mud D scooped up on A is put into the mud storage tank 19 above the guide surface 17A, the mud distance is relatively short, and the rotary drive device and the like can be made compact and lightweight. Further, in the present embodiment, the height dimension of the excavating blade 10 can be shortened, and the interval between the excavating blades 10 adjacent to each other in the front and rear can be made relatively long, so that the adhesion of the mud D can be further prevented. it can. Further, the excavating blade 10 slides on the bottom guide surface 17A, but since other members have few sliding portions, there is less fear of wear of the members. Further, since the transport path 9A of the chain 9 moves in the traveling direction of the dredging device body S, the mud D can be satisfactorily lifted on the bottom guide surface 17A.

As described above, in this embodiment, the angle adjusting mechanism 25 for integrally inclining the conveyor 1 and the bottom guide surface 17A is provided in accordance with the second aspect of the present invention. By adjusting it to a large value, it becomes possible to perform dredging of thick mud from thin mud, and in the case of dredging mud D having a large viscosity, if the inclination angle θ is reduced, the excavating blade 10 becomes vertical. It became close, and mud D to the excavating blade 10
Can be further prevented.

Further, as an effect of the embodiment, the chain 9 has a slanted conveying path 9A corresponding to the bottom guide surface 17A, and the inner ends 10A of the excavating blades 10, 10 adjacent in the front and rear, 10 A
Since the space is open, water can be drained quickly from this opening.

FIG. 5 shows a second embodiment of the present invention, in which the same parts as those in the first embodiment are designated by the same reference numerals, and detailed description thereof will be omitted. The present invention shows an example in which the mud storage tank 19A formed in 1 is provided, the sand pump 20 is arranged on the right side of the mud storage tank 19A, and the screw conveyor 43 for transferring the mud to the right side is provided in the mud storage tank 19A. In this device, a mud storage tank is installed outside the conveyor 1.
Since 19A is provided, the mud storage tank 19A can be enlarged.

The present invention is not limited to the above embodiment, but various modifications can be made within the scope of the present invention. For example, in the embodiment, a chain is used for the endless belt. Although shown, it is also possible to use a belt having substantially the same width on the left and right sides of the conveyor, and in this case, a digging blade may be provided on the belt at right angles to the length direction of the belt. Also,
If a part of the conveyor, for example, the lower sprocket 8 and the lower bearing 5 are covered with rubber or the like, the durability and abrasion resistance are further improved. Further, although the sand pump is used as the pressure feeding means in the embodiment, a pump of another type such as a piston type may be used.

[0022]

According to the invention of claim 1, a conveyor obliquely installed in an airtight hood having a lower opening for excavation, and a plurality of excavating blades provided on an endless belt of the conveyor and protruding to the outer periphery, Rotational drive means for rotationally driving the endless belt of the conveyor, and a bottom guide surface provided in the airtight hood and provided substantially parallel to the outer circumference of the endless belt at intervals.
It was connected to the airtight hood, and a mud storage tank provided at the upper part of the bottom guide surface so as to communicate with the inside of the airtight hood and having a charging port for charging the mud scraped up on the bottom guide surface by the digging blade. A high-concentration dredging device having an air supply port and a pressure-feeding means for pressure-feeding the mud in the mud storage tank to a treatment site through a pipeline, and having a simple structure and capable of continuous high-concentration dredging. can do.

According to the second aspect of the present invention, an angle adjusting mechanism for integrally tilting the conveyor and the bottom guide surface is provided, and the structure is simplified to enable continuous high-concentration dredging. It is possible to provide a high-concentration dredging device capable of performing dredging adapted to the soil quality and the thickness of the mud layer.

[Brief description of drawings]

FIG. 1 is a sectional view showing a first embodiment of the present invention.

FIG. 2 is a partially cutaway plan view showing the first embodiment of the present invention.

FIG. 3 is a front view of the main part showing the first embodiment of the present invention.

FIG. 4 is a sectional view around the excavation opening showing the first embodiment of the present invention.

FIG. 5 is a front view of a main part showing a second embodiment of the present invention.

[Explanation of symbols]

 1 Conveyor 9 Chain (Endless Band) 10 Drilling Blade 11 Drilling Opening 12 Airtight Hood 17A Bottom Guide Surface 18 Input Port 19 Mud Storage Tank 20 Sand Pump (Pressurizing Means) 22 Mud Pipe (Pipeline) 23 Air Supply Mouth 25 Angle adjustment mechanism 29 Rotation drive means D Mud

Claims (2)

[Claims] 1. A conveyor obliquely installed in an airtight hood having a lower opening for excavation, a plurality of digging blades provided on an endless belt of the conveyor and protruding to the outer periphery, and an endless belt of the conveyor. A rotary drive means for rotating and driving, a bottom guide surface provided in the airtight hood substantially parallel to the outer circumference of the endless strip at intervals, and an upper part of the bottom guide surface in the airtight hood. A mud storage tank having a charging port for charging mud scraped up on the bottom guide surface by the drilling blade, an air supply port connected to the airtight hood, and mud in the mud storage tank. And a high-concentration dredging device, which includes a pressure-feeding unit that pressure-feeds the water to a treatment site through a pipeline. 2. The high-concentration dredging device according to claim 1, further comprising an angle adjusting mechanism for integrally tilting the conveyor and the bottom guide surface.